1. Pick a location where you can keep your set, lighting and LEGO stationary.
2. Select a backdrop. You can use a picture, paper from the libary, etc.
3. Create your set and characters out of LEGO
4. Setup your lighting.
5. Start taking pictures! Try to film as much as you can for a scene in one day. Remember to use freeze frames for dialog and recycle shots to produce a repetitive motion.
6. Good Luck!